Oberyn Nymeros Martell

Brother to the Prince of Dorne, Prince Oberyn is an infamous figure, and dangerous. Rumored to have used poison in a duel—at the age of 16—against a famous, but aged, Dornish warrior, he has been a source of gossip for many years: his alleged knowledge of the dark arts, his time in the Citadel, his many lovers (women and, allegedly, boys included), his bastard daughters called the Sand Snakes, his time as a sellsword in the east, his effort to raise Dorne in rebellion against King Robert, and more. His paramour is Ellaria Sand, a bastard herself and the mother of the youngest Sand Snakes.